package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.DigestUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.manager.auth.StpKit;
import com.yupi.yupicturebackend.model.constant.UserConstant;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.user.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.user.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import static com.yupi.yupicturebackend.model.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author 35534
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-03-29 16:49:58
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService {



    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 校验
        if(StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if(userPassword.length() < 6 || checkPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if(!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        // 账户不能重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        Long count = this.count(queryWrapper);
        if(count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 2. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("未命名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if(!saveResult){
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        log.info("用户注册成功，用户ID：" + user.getId());
        return user.getId();
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        final String salt = "lcz";
        return DigestUtil.md5Hex((userPassword + salt).getBytes());
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if(StrUtil.hasBlank(userAccount, userPassword)){
            log.info("参数为空");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if(userAccount.length() < 4 || userPassword.length() < 8){
            log.info("账号或密码格式错误");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号或密码格式错误");
        }
        // 2. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.getOne(queryWrapper);
        if(user == null){
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号或密码错误");
        }
        // 4. 记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        // 保存登录态到Sa-token，便于空间鉴权中使用，注意保证用户信息与SpringSession中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE, user);
        log.info("用户登录成功，用户ID：" + user.getId());
        return this.getLoginUserVO(user);
    }
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 先判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }


    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 1. 判断是否已登录
        Object userObject = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (userObject == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        // 2. 移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        log.info("用户退出登录，用户ID：" + userObject);
        return true;
    }



    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取列表封装
     *
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollectionUtils.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }


    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        if (userQueryRequest == null) {
            return queryWrapper;
        }
        //从对象中获取值
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        queryWrapper.eq(Objects.nonNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotBlank(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }


}




